2
02
1-
09
34
Functional Safety K-LB-*.*, F*-LB-I, P-LB-*.*.*
Application Examples
Combined with the characteristics for the surge protection barrier F*-LB-I the result is:
Derived from this results using equation 4:
The proof that the transmitter is still feasible for IEC/EN 61508 SIL 2 safety loops is done,
since SFF and PFD
avg
values are still sufficient.
Total failure rate
536 FIT + 7 FIT = 543 FIT (rounded)
MTBF
210 years
Safe failure rate
143 FIT
Dangerous undetected failure rate
57 FIT
Dangerous detected failure rate
356 FIT + 7 FIT = 363 FIT (rounded)
SFF
89 %
Table 7.13 Sum of failure rates of Rosemount 3051S_C and surge protection barrier F*-LB-I
T
1
1 year
2 years
5 years
PFD
avg
2.50 x 10
-4
5.00 x 10
-4
1.25 x 10
-4
Table 7.14 PFD
avg
values of the combination of Rosemount 3051S_C and surge protection barrier
F*-LB-I
